## Exact observer-based structures for arbitrary compensators.(English)Zbl 0919.93015

The authors consider the computation of observer-based structures for general compensators. The Youla parametrization is used to generalize the technique to arbitrary-order compensators while maintaining the validity of the separation principle. The technique is based on the solution to a generalized nonsymmetric Riccati equation. Necessary conditions are given for the solvability of this equation in terms of observability and controllability properties of the plant. The results are then specialized to $$H_\infty$$ or $$\mu$$ controllers which arise from an augmented synthesis structure.

### MSC:

 93B07 Observability
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### References:

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